fix(android): generate version for ReactNativeFirebaseAppRegistrar.java (#3766)

* build(android): script for version

* chore(android): rm ReactNativeFirebaseAppRegistrar

* build(android): create new version class

* chore(android): update script file name

* chore(app, android): formatting

Co-authored-by: Mike Diarmid <mike.diarmid@gmail.com>
[publish]

packages/app/scripts/genversion-android.js

@@ -0,0 +1,36 @@
+const fs = require('fs');
+const path = require('path');
+
+const version = require('../lib/version');
+const outputPath = path.resolve(
+  __dirname,
+  '..',
+  'android',
+  'src/reactnative/java/io/invertase/firebase/app',
+  'ReactNativeFirebaseVersion.java',
+);
+const template = `
+package io.invertase.firebase.app;
+/*
+ * Copyright (c) 2016-present Invertase Limited & Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this library except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+// generated file - do not modify or commit
+public class ReactNativeFirebaseVersion {
+  public static String VERSION = "version_number";
+}
+`;
+
+fs.writeFileSync(outputPath, template.replace('version_number', `${version}`), 'utf8');